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qgsmodelgraphicsscene.cpp
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qgsmodelgraphicsscene.cpp
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/***************************************************************************
qgsmodelgraphicsscene.cpp
----------------------------------
Date : March 2020
Copyright : (C) 2020 Nyall Dawson
Email : nyall dot dawson at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsmodelgraphicsscene.h"
#include "qgsprocessingmodelchildparametersource.h"
#include "qgsprocessingmodelalgorithm.h"
#include "qgsmodelcomponentgraphicitem.h"
#include "qgsmodelarrowitem.h"
#include <QGraphicsSceneMouseEvent>
///@cond NOT_STABLE
QgsModelGraphicsScene::QgsModelGraphicsScene( QObject *parent )
: QGraphicsScene( parent )
{
setItemIndexMethod( QGraphicsScene::NoIndex );
}
void QgsModelGraphicsScene::setFlag( QgsModelGraphicsScene::Flag flag, bool on )
{
if ( on )
mFlags |= flag;
else
mFlags &= ~flag;
}
void QgsModelGraphicsScene::mousePressEvent( QGraphicsSceneMouseEvent *event )
{
if ( event->button() != Qt::LeftButton )
return;
QGraphicsScene::mousePressEvent( event );
}
QgsModelComponentGraphicItem *QgsModelGraphicsScene::createParameterGraphicItem( QgsProcessingModelAlgorithm *model, QgsProcessingModelParameter *param ) const
{
return new QgsModelParameterGraphicItem( param, model, nullptr );
}
QgsModelComponentGraphicItem *QgsModelGraphicsScene::createChildAlgGraphicItem( QgsProcessingModelAlgorithm *model, QgsProcessingModelChildAlgorithm *child ) const
{
return new QgsModelChildAlgorithmGraphicItem( child, model, nullptr );
}
QgsModelComponentGraphicItem *QgsModelGraphicsScene::createOutputGraphicItem( QgsProcessingModelAlgorithm *model, QgsProcessingModelOutput *output ) const
{
return new QgsModelOutputGraphicItem( output, model, nullptr );
}
QgsModelComponentGraphicItem *QgsModelGraphicsScene::createCommentGraphicItem( QgsProcessingModelAlgorithm *model, QgsProcessingModelComment *comment, QgsModelComponentGraphicItem *parentItem ) const
{
return new QgsModelCommentGraphicItem( comment, parentItem, model, nullptr );
}
void QgsModelGraphicsScene::createItems( QgsProcessingModelAlgorithm *model, QgsProcessingContext &context )
{
// model input parameters
const QMap<QString, QgsProcessingModelParameter> params = model->parameterComponents();
for ( auto it = params.constBegin(); it != params.constEnd(); ++it )
{
QgsModelComponentGraphicItem *item = createParameterGraphicItem( model, it.value().clone() );
addItem( item );
item->setPos( it.value().position().x(), it.value().position().y() );
mParameterItems.insert( it.value().parameterName(), item );
connect( item, &QgsModelComponentGraphicItem::requestModelRepaint, this, &QgsModelGraphicsScene::rebuildRequired );
connect( item, &QgsModelComponentGraphicItem::changed, this, &QgsModelGraphicsScene::componentChanged );
connect( item, &QgsModelComponentGraphicItem::aboutToChange, this, &QgsModelGraphicsScene::componentAboutToChange );
addCommentItemForComponent( model, it.value(), item );
}
// input dependency arrows
for ( auto it = params.constBegin(); it != params.constEnd(); ++it )
{
const QgsProcessingParameterDefinition *parameterDef = model->parameterDefinition( it.key() );
const QStringList parameterLinks = parameterDef->dependsOnOtherParameters();
for ( const QString &otherName : parameterLinks )
{
if ( mParameterItems.contains( it.key() ) && mParameterItems.contains( otherName ) )
{
std::unique_ptr< QgsModelArrowItem > arrow = qgis::make_unique< QgsModelArrowItem >( mParameterItems.value( otherName ), mParameterItems.value( it.key() ) );
arrow->setPenStyle( Qt::DotLine );
addItem( arrow.release() );
}
}
}
// child algorithms
const QMap<QString, QgsProcessingModelChildAlgorithm> childAlgs = model->childAlgorithms();
for ( auto it = childAlgs.constBegin(); it != childAlgs.constEnd(); ++it )
{
QgsModelComponentGraphicItem *item = createChildAlgGraphicItem( model, it.value().clone() );
addItem( item );
item->setPos( it.value().position().x(), it.value().position().y() );
mChildAlgorithmItems.insert( it.value().childId(), item );
connect( item, &QgsModelComponentGraphicItem::requestModelRepaint, this, &QgsModelGraphicsScene::rebuildRequired );
connect( item, &QgsModelComponentGraphicItem::changed, this, &QgsModelGraphicsScene::componentChanged );
connect( item, &QgsModelComponentGraphicItem::aboutToChange, this, &QgsModelGraphicsScene::componentAboutToChange );
addCommentItemForComponent( model, it.value(), item );
}
// arrows linking child algorithms
for ( auto it = childAlgs.constBegin(); it != childAlgs.constEnd(); ++it )
{
int idx = 0;
if ( !it.value().algorithm() )
continue;
const QgsProcessingParameterDefinitions parameters = it.value().algorithm()->parameterDefinitions();
for ( const QgsProcessingParameterDefinition *parameter : parameters )
{
if ( !parameter->isDestination() && !( parameter->flags() & QgsProcessingParameterDefinition::FlagHidden ) )
{
QList< QgsProcessingModelChildParameterSource > sources;
if ( it.value().parameterSources().contains( parameter->name() ) )
sources = it.value().parameterSources()[parameter->name()];
for ( const QgsProcessingModelChildParameterSource &source : sources )
{
const QList< LinkSource > sourceItems = linkSourcesForParameterValue( model, QVariant::fromValue( source ), it.value().childId(), context );
for ( const LinkSource &link : sourceItems )
{
QgsModelArrowItem *arrow = nullptr;
if ( link.linkIndex == -1 )
arrow = new QgsModelArrowItem( link.item, mChildAlgorithmItems.value( it.value().childId() ), Qt::TopEdge, idx );
else
arrow = new QgsModelArrowItem( link.item, link.edge, link.linkIndex, mChildAlgorithmItems.value( it.value().childId() ), Qt::TopEdge, idx );
addItem( arrow );
}
idx += 1;
}
}
}
const QStringList dependencies = it.value().dependencies();
for ( const QString &depend : dependencies )
{
addItem( new QgsModelArrowItem( mChildAlgorithmItems.value( depend ), mChildAlgorithmItems.value( it.value().childId() ) ) );
}
}
// and finally the model outputs
for ( auto it = childAlgs.constBegin(); it != childAlgs.constEnd(); ++it )
{
const QMap<QString, QgsProcessingModelOutput> outputs = it.value().modelOutputs();
QMap< QString, QgsModelComponentGraphicItem * > outputItems;
for ( auto outputIt = outputs.constBegin(); outputIt != outputs.constEnd(); ++outputIt )
{
QgsModelComponentGraphicItem *item = createOutputGraphicItem( model, outputIt.value().clone() );
addItem( item );
connect( item, &QgsModelComponentGraphicItem::requestModelRepaint, this, &QgsModelGraphicsScene::rebuildRequired );
connect( item, &QgsModelComponentGraphicItem::changed, this, &QgsModelGraphicsScene::componentChanged );
connect( item, &QgsModelComponentGraphicItem::aboutToChange, this, &QgsModelGraphicsScene::componentAboutToChange );
addCommentItemForComponent( model, outputIt.value(), item );
QPointF pos = outputIt.value().position();
int idx = -1;
int i = 0;
// find the actual index of the linked output from the child algorithm it comes from
if ( it.value().algorithm() )
{
const QgsProcessingOutputDefinitions sourceChildAlgOutputs = it.value().algorithm()->outputDefinitions();
for ( const QgsProcessingOutputDefinition *childAlgOutput : sourceChildAlgOutputs )
{
if ( childAlgOutput->name() == outputIt.value().childOutputName() )
{
idx = i;
break;
}
i++;
}
}
item->setPos( pos );
outputItems.insert( outputIt.key(), item );
addItem( new QgsModelArrowItem( mChildAlgorithmItems[it.value().childId()], Qt::BottomEdge, idx, item ) );
}
mOutputItems.insert( it.value().childId(), outputItems );
}
}
QList<QgsModelComponentGraphicItem *> QgsModelGraphicsScene::selectedComponentItems()
{
QList<QgsModelComponentGraphicItem *> componentItemList;
const QList<QGraphicsItem *> graphicsItemList = selectedItems();
for ( QGraphicsItem *item : graphicsItemList )
{
if ( QgsModelComponentGraphicItem *componentItem = dynamic_cast<QgsModelComponentGraphicItem *>( item ) )
{
componentItemList.push_back( componentItem );
}
}
return componentItemList;
}
QgsModelComponentGraphicItem *QgsModelGraphicsScene::componentItemAt( QPointF position ) const
{
//get a list of items which intersect the specified position, in descending z order
const QList<QGraphicsItem *> itemList = items( position, Qt::IntersectsItemShape, Qt::DescendingOrder );
for ( QGraphicsItem *graphicsItem : itemList )
{
if ( QgsModelComponentGraphicItem *componentItem = dynamic_cast<QgsModelComponentGraphicItem *>( graphicsItem ) )
{
return componentItem;
}
}
return nullptr;
}
void QgsModelGraphicsScene::selectAll()
{
//select all items in scene
QgsModelComponentGraphicItem *focusedItem = nullptr;
const QList<QGraphicsItem *> itemList = items();
for ( QGraphicsItem *graphicsItem : itemList )
{
if ( QgsModelComponentGraphicItem *componentItem = dynamic_cast<QgsModelComponentGraphicItem *>( graphicsItem ) )
{
componentItem->setSelected( true );
if ( !focusedItem )
focusedItem = componentItem;
}
}
emit selectedItemChanged( focusedItem );
}
void QgsModelGraphicsScene::deselectAll()
{
//we can't use QGraphicsScene::clearSelection, as that emits no signals
//and we don't know which items are being deselected
//instead, do the clear selection manually...
const QList<QGraphicsItem *> selectedItemList = selectedItems();
for ( QGraphicsItem *item : selectedItemList )
{
if ( QgsModelComponentGraphicItem *componentItem = dynamic_cast<QgsModelComponentGraphicItem *>( item ) )
{
componentItem->setSelected( false );
}
}
emit selectedItemChanged( nullptr );
}
void QgsModelGraphicsScene::setSelectedItem( QgsModelComponentGraphicItem *item )
{
whileBlocking( this )->deselectAll();
if ( item )
{
item->setSelected( true );
}
emit selectedItemChanged( item );
}
QList<QgsModelGraphicsScene::LinkSource> QgsModelGraphicsScene::linkSourcesForParameterValue( QgsProcessingModelAlgorithm *model, const QVariant &value, const QString &childId, QgsProcessingContext &context ) const
{
QList<QgsModelGraphicsScene::LinkSource> res;
if ( value.type() == QVariant::List )
{
const QVariantList list = value.toList();
for ( const QVariant &v : list )
res.append( linkSourcesForParameterValue( model, v, childId, context ) );
}
else if ( value.type() == QVariant::StringList )
{
const QStringList list = value.toStringList();
for ( const QString &v : list )
res.append( linkSourcesForParameterValue( model, v, childId, context ) );
}
else if ( value.canConvert< QgsProcessingModelChildParameterSource >() )
{
const QgsProcessingModelChildParameterSource source = value.value< QgsProcessingModelChildParameterSource >();
switch ( source.source() )
{
case QgsProcessingModelChildParameterSource::ModelParameter:
{
LinkSource l;
l.item = mParameterItems.value( source.parameterName() );
res.append( l );
break;
}
case QgsProcessingModelChildParameterSource::ChildOutput:
{
if ( !model->childAlgorithm( source.outputChildId() ).algorithm() )
break;
const QgsProcessingOutputDefinitions outputs = model->childAlgorithm( source.outputChildId() ).algorithm()->outputDefinitions();
int i = 0;
for ( const QgsProcessingOutputDefinition *output : outputs )
{
if ( output->name() == source.outputName() )
break;
i++;
}
if ( mChildAlgorithmItems.contains( source.outputChildId() ) )
{
LinkSource l;
l.item = mChildAlgorithmItems.value( source.outputChildId() );
l.edge = Qt::BottomEdge;
l.linkIndex = i;
res.append( l );
}
break;
}
case QgsProcessingModelChildParameterSource::Expression:
{
const QMap<QString, QgsProcessingModelAlgorithm::VariableDefinition> variables = model->variablesForChildAlgorithm( childId, context );
QgsExpression exp( source.expression() );
const QSet<QString> vars = exp.referencedVariables();
for ( const QString &v : vars )
{
if ( variables.contains( v ) )
{
res.append( linkSourcesForParameterValue( model, QVariant::fromValue( variables.value( v ).source ), childId, context ) );
}
}
break;
}
case QgsProcessingModelChildParameterSource::StaticValue:
case QgsProcessingModelChildParameterSource::ExpressionText:
break;
}
}
return res;
}
void QgsModelGraphicsScene::addCommentItemForComponent( QgsProcessingModelAlgorithm *model, const QgsProcessingModelComponent &component, QgsModelComponentGraphicItem *parentItem )
{
if ( mFlags & FlagHideComments || !component.comment() || component.comment()->description().isEmpty() )
return;
QgsModelComponentGraphicItem *commentItem = createCommentGraphicItem( model, component.comment()->clone(), parentItem );
commentItem->setPos( component.comment()->position().x(), component.comment()->position().y() );
addItem( commentItem );
connect( commentItem, &QgsModelComponentGraphicItem::requestModelRepaint, this, &QgsModelGraphicsScene::rebuildRequired );
connect( commentItem, &QgsModelComponentGraphicItem::changed, this, &QgsModelGraphicsScene::componentChanged );
connect( commentItem, &QgsModelComponentGraphicItem::aboutToChange, this, &QgsModelGraphicsScene::componentAboutToChange );
std::unique_ptr< QgsModelArrowItem > arrow = qgis::make_unique< QgsModelArrowItem >( parentItem, commentItem );
arrow->setPenStyle( Qt::DotLine );
addItem( arrow.release() );
}
///@endcond